Spirometer.



NO- 829,232. PATENTED AUG 21, 1906. E. A. REEVES. SPIROMBTER.

APPLICATION FILED AUG. 24, 1905.

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EDWIN A. REEVES, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO THE REEVES MANUFACTURING COMPANY, OF NEW HAVEN, CONNECTI- CUT, A CORPORATION OF CONNECTICUT.

SPIROMETER.

Specification of Letters Patent.

Patented Aug. 21, 1906.

Application filed August 24, 1905. Serial No. 275,533.

To all whom it may concern.-

Be it known that I, EDWIN A. Reeves, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Im rovements in S irometers, of which the following is a specification, reference being had therein to the accompanyin drawings.

y invention relates to new and useful im provements in spirometers, and has for its object, among other things, to mount the pointer and fan with a common axis and permit the return of the pointer to its startingpoint without imparting movement to other arts, and, further, to construct the device of ew parts so designed as to be readily assembled and produced at the minimum cost.

To these and other ends my invention consists in the spirometer having certain details of construction and combinations of parts, as Will be hereinafter described, and more particularly pointed out in the claim.

Referring to the drawings, in which like numerals of reference designate like parts in the several figures, Figure 1 is a front view of my device complete. Fig. 2 is a transverse section thereof upon line A B of Fig. 1, and Fig. 3 is a sectional plan view thereof upon line C D of Fig. 2.

In carr in out my invention I provide a case, pre era 1y circular, having a bottom member 1, to which is affixed the shank 4, having a hole 5 therethrough, which is concentric to said shank at one end. and inclines at an angle thereto at the other end, where it enters the case, as shown in Fig. 3, and a cover member 2, having a frictional enga ement with the bottom member. Within t e case is the mechanism for actuating the pointer 3, which moves in a circular ath above the cover member 2, and comprising a fan 6, havin a plurality of wings 7 thereon, fixed to a co lar 8, secured to the shaft 9, a pinion 10, that meshes into a gear 11 upon the shaft 12, and a fixed pinion 13. The shaft 10 is rotatably mounted in the plate 14, which is connected with a similar plate 15 by rods 16. The plate 15 is secured to the cover member 2 by any preferred means. As herein shown, a solder joint 17 is used; but I do not desire, however, to limit myself to this articular form of securing means. Rotate Is in the cover member 2 and plate 15 is a shaft 18, having a collar 19 thereon, and to which is fixed the pointer 3. Itestin upon this collar and rotatable about the sl iaft 18 is a gear 20, which meshes into the gear 13. Secured to the shaft 18 is the cup-spring 21, the outer ends of which bear upon the top of the gear 20 and hold it frietionally against the collar 19. The upper end of the shaft 9 is tapered, as shown in Fig. 2, and the lower end of the shaft 18 is countersunk to eorres end therewith, permitting both of the shaf s to rotate independently of each other, but about the same axis.

In the drawings I have illustrated only one set of gears between the pinion 10 and gear 20; but two or more sets may be used, if desired, so as to give a greater variation between the speed of rotation of the fan 6 and the pointer 3.

In operation the air passes through the tube 22 and hole 5 into the case, striking the Wings '7 of the fan 6 and rotating said fan, which rotation is transmitted through the pinion 10, gear 11, pinion 13, and gear 20 to the shaft 18 and pointer 3. The air escapes from the case through a hole 23 in the bottom member 1. The graduations upon the cover member 2 register the number of cubic inches of air that have been brought into contact with the wings of the fan. The pointer 3 can he returned manually to its original position, the shaft 18 revolving within the gear 20, which is held. against rotation by its engagement with the pinion 13.

There are minor changes and alterations that can be made within my invention aside from those herein suggested, and I would therefore have it understood that I do not limit myself to the exact construction herein shown and described, but claim all that falls fairly within the spirit and scope of my inventheir outer ends and having a hearing engage tion. ment with each other at their inner ends. 10 What I claim as new, and desire toseoure In testimony whereof I aflix my signature by Letters Patent, is in preseneeof two witnesses. 5 In a SpiPOlnOfi81,- the combination with a EDWIN A. REEVES.

case; of a pointer-shaft; and a fan-shaft, hay- Witnesses: in a fan connected therewith, said shafts GEORGE E. HALL,

being rotatably mounted in fixed parts near J. P. DEJON. 

